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Computerized potentiometric determination of stability constants of metal ion‐crown complexes by the method of corresponding solutions
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机译：Computerized potentiometric determination of stability constants of metal ion‐crown complexes by the method of corresponding solutions
AbstractTwo computerized potentiometric methods have been used to determine the stability constants of Na+, K+, and NH+4complexes with 18‐crown‐6 in methanol‐water solutions (70% volume fraction of methanol) at 25.0 ± 01°C, and at constant ionic strength I = 0.1 M, adjusted with tetrabutylammonium iodide (TBAI). One method assumes a single complex equilibrium, while the method of corresponding solutions assumes the presence of simultaneous multiequilibria. It has been shown using the second method that K+ion, even with 18‐crown‐6 ligand, can form both ML and sandwich‐type ML2complexes, found so far only with smaller crown rings. The other two cations investigated form only ML complexes, as was confirmed by
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